Only qualified service technicians who are familiar with safety checks
and guidelines should perform service work. Before replacing parts,
disconnect power source to protect electrostatically sensitive parts. Do
not attempt to modify any circuit unless so recommended by the
manufacturer. When servicing the receiver, use an isolation transformer
between the line cord and power receptacle.
SERSER
SER
SERSER
Use EXTREME CAUTION when servicing the high voltage circuits. To
discharge static high voltage, connect a 10K ohms resistor in series with a
test lead between the receiver ground and CRT anode lead. DO NOT lift
the CRT by the neck. Always wear shatterproof goggles when handling
the CRT to protect eyes in case of implosion.
X-RAX-RA
X-RA
X-RAX-RA
Be aware of the instructions and procedures covering X-ray radiation. In
solid-state receivers and monitors, the CRT is the only potential source of
X-rays. Keep an accurate high voltage meter available at all times. Check
meter calibration periodically. Whenever servicing a receiver, check the
high voltage at various brightness levels to be sure it is regulating
properly. Keep high voltage at rated value, NO HIGHER. Excessive high
voltage may cause X-ray radiation or failure of associated components.
DO NOT depend on protection circuits to keep voltage at rated value.
When troubleshooting a receiver with excessive high voltage, avoid close
contact with the CRT. DO NOT operate the receiver longer than
necessary. To locate the cause of excessive high voltage, use a variable
AC transformer to regulate voltage. In present receivers, many electrical
and mechanical components have safety related characteristics which are
not detectable by visual inspection. Such components are identified by a
# on both the schematic and the parts list. For SAFETY, use only
equivalent replacement parts when replacing these components.
GENERAL GUIDELINESGENERAL GUIDELINES
GENERAL GUIDELINES
GENERAL GUIDELINESGENERAL GUIDELINES
Perform a final SAFETY CHECK before returning receiver to customer.
Check repaired area for poorly soldered connections, and check entire
circuit board for solder splashes. Check board wiring for pinched wires or
wires contacting any high wattage resistors. Check that all control knobs,
shields, covers, grounds, and mounting hardware have been replaced. Be
sure to replace all insulators and restore proper lead dress.
WARNINGWARNING
VICE
WARNING
VICE VICE
WARNINGWARNING
VICING VICING
VICING
VICING VICING
Y RADIAY RADIA
Y RADIA
Y RADIAY RADIA
THE HIGH THE HIGH
THE HIGH
THE HIGH THE HIGH
TION AND HIGH TION AND HIGH
TION AND HIGH
TION AND HIGH TION AND HIGH
VV
OLOL
V
OL
VV
OLOL
TT
AA
GE AND CRGE AND CR
T
A
GE AND CR
TT
AA
GE AND CRGE AND CR
VV
OLOL
TT
V
OL
T
VV
OLOL
TT
TT
T
TT
AA
GE LIMITSGE LIMITS
A
GE LIMITS
AA
GE LIMITSGE LIMITS
UTIONSUTIONS
UTIONS
UTIONSUTIONS
SAFETY CHECKS — FIRE AND SHOCK HAZARDSAFETY CHECKS — FIRE AND SHOCK HAZARD
SAFETY CHECKS — FIRE AND SHOCK HAZARD
SAFETY CHECKS — FIRE AND SHOCK HAZARDSAFETY CHECKS — FIRE AND SHOCK HAZARD
Cold LeakaCold Leaka
Cold Leaka
Cold LeakaCold Leaka
Unplug the AC cord, connect a jumper across the plug pr ongs, and turn
the power switch on (if applicable). Use an ohmmeter to measure the
resistance between the jumped AC plug and any exposed metal cabinet
parts such as antenna screw heads, control shafts, or handle brackets.
Exposed metal parts with a return path should measure between 1M
ohms and 5.2M ohms. Parts without a return path must measure infinity.
Hot LeakaHot Leaka
Hot Leaka
Hot LeakaHot Leaka
Plug the AC cord directly into an AC outlet. DO NOT use an isolation
transformer. Use a 1500 ohms, 10W resistor in parallel with a .15µF
capacitor to connect between any exposed metal parts on the receiver and
a good earth ground. (See figure below.) Use an AC voltmeter with at
least 5000 ohms per volt sensitivity to measure the voltage across the
resistor. Check all exposed metal parts and measure voltage at each point.
Voltage measurements should not exceed .75VAC, 500µA. Any value
exceeding this limit constitutes a potential shock hazard and must be
corrected. If the AC plug is not polarized, reverse the AC plug and repeat
exposed metal part voltage measurement at each point.
Television ........................................ 2
Technical Service Data
RCARCA
RCA
RCARCA
Model G27648YX1 (Chassis CTC203AA)Model G27648YX1 (Chassis CTC203AA)
Model G27648YX1 (Chassis CTC203AA)
Model G27648YX1 (Chassis CTC203AA)Model G27648YX1 (Chassis CTC203AA)
Representative Model
ff
or seror ser
f
or ser
ff
or seror ser
Essential coEssential co
Essential co
Essential coEssential co
vicing a televicing a tele
vicing a tele
vicing a televicing a tele
ScSc
hematicshematics
•
Sc
hematics
ScSc
hematicshematics
veravera
gg
vera
veravera
vision receivervision receiver
vision receiver
vision receivervision receiver
ee
g
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gg
ee
......
...
......
4733
4733
HIGH HIGH
VV
OLOL
TT
AA
HIGH
V
HIGH HIGH
VV
Momentarily short BC14901 (see Q14901 base) to ground. The receiver should lose raster and sound. If
receiver does not lose raster and sound, the shutdown circuit should be repaired. To resume normal
operation, remove AC power for approximately 30 seconds and then turn the receiver on.
The listing of any available replacement part herein in no case constitutes a recommendation, warranty, or guarantee by
SAMS Technical Publishing as to the quality and suitability of such replacement part. The numbers of the listed parts have
been compiled from information furnished to SAMS Technical Publishing by the manufacturers of the specific type of
replacement part listed.
Reproduction or use, without express permission, of editorial or pictorial content, in any manner, is prohibited. No patent
liability is assumed with respect to the use of the information contained herein.
VHF High Band voltages taken on channel 7.
UHF Band voltages taken on channel 14.
w Bandw Band
w Band
w Bandw Band
VV
OLOL
TT
V
OL
T
VV
OLOL
TT
AA
GE CHARGE CHAR
A
GE CHAR
AA
GE CHARGE CHAR
VHF High BandVHF High Band
VHF High Band
VHF High BandVHF High Band
TT
T
TT
UHF BandUHF Band
UHF Band
UHF BandUHF Band
TUNER TUNER
TUNER
TUNER TUNER
(2)
(4)
(6)
TERMINAL GUIDETERMINAL GUIDE
TERMINAL GUIDE
TERMINAL GUIDETERMINAL GUIDE
(1)
t
t
(3)
t
t
(5)
t
t
(7)
t
(9)
t
(11)
t
MISCELLANEOUS ADJUSTMENTS
NOTE: All procedures require an antenna connected and power applied
to the set.
HIGH HIGH
VV
OLOL
TT
AA
HIGH
V
HIGH HIGH
VV
Tune in a picture. Set brightness, contrast, and color to minium. Connect
a high voltage probe to the CRT anode. High voltage should measure
between 26kV and 28kV.
SERSER
VICE MENUVICE MENU
SER
VICE MENU
SERSER
VICE MENUVICE MENU
The following adjustment procedures are accessed thru a service menu. To access the service menu, turn the receiver on, press the menu button
and hold it down while pressing the power button. While holding down the menu button, release the power button and press the volume +
button. The screen will display a one line menu, on the left the parameter P0, and on the right the value of that parameter V0. Release buttons.
Adjustments are made by selecting the proper parameter and changing the value of that parameter. To change the parameter number use channel
up and down buttons. To adjust the current value of that parameter use volume + and - buttons. To access and change any of the adjustments, the
proper parameter pass number must be entered. This information is listed at the beginning of the alignment. When these parameters are
modified, the T-Chip and the corresponding EEPROM are updated. All service adjustments are bus controlled, except focus and screen.
NOTE: In order to adjust the RF AGC, audio or video levels, tuner, PIP, or stereo circuits, the ChipperCheck hardware and software must be
used. This can be purchased from Thomson Electronics. Before making any changes to any of the values, record the On Set values.
NOTE: See Service Adjustment Parameters to change drive and bias
values.
Press menu button for collapsed raster service line. Disconnect the
antenna. Preset the red, green, and blue drive values to 32. Adjust
screen control for a service line that is just visible. Adjust red,
green, and blue drives to obtain a white raster. Check the low light
to high light gray scale tracking. Repeat the procedure, if necessary, to obtain the best performance.
ee
e
ee
TEMPERATEMPERA
TEMPERA
TEMPERATEMPERA
CommentComment
Comment
CommentComment
TURETURE
TURE
TURETURE
0Pass number for serviceMust set to 76-May not advance until value is set to 76.
adjustment parameters.
1Error Code 100 - 255Displays the first error detected. Set to 0 before exiting.
See Error Codes Chart.
2Error Code 200 - 255Displays the second error detected. Set to 0 before exiting.
See Error Codes Chart.
3Error Code 300 - 255Displays the last error detected. Set to 0 before exiting.
See Error Codes Chart.
4Horizontal Phase100 - 15Tune in a crosshatch pattern, adjust to center the pattern on
the screen.
5EW DC (Width)160 - 31Tune in a crosshatch pattern, adjust for slight horizontal
overscan.
6EW Amplitude80 - 15Set value to 8.
7EW Tilt80 - 15Set value to 8.
8Top Corner Pin Correction20 - 7Set value to 2.
9Bottom Corner Pin Correction20 - 7Set value to 2.
10Vertical DC330 - 63Tune in a crosshatch pattern, adjust to center vertically.
11Vertical Size840 - 127Tune in a crosshatch pattern, adjust for slight vertical
overscan.
12Vertical Countdown Mode00 - 3Set value to 0. ( 0 = Standard, 1 = Non-Standard, 2 = 50Hz,
3 = 48Hz )
13Red Bias300 - 127Press menu button on the TV set for setup line.
14Green Bias150 - 127Press menu button on the TV set for setup line.
15Blue Bias340 - 127Press menu button on the TV set for setup line.
16Red Drive410 - 6317Green Drive330 - 6318Blue Drive320 - 6319Gemstar Horizontal OSD Position1660 - 255Set value to 166.
20Gemstar Vertical OSD Position680 - 255Set value to 68.
21Gemstar PIP Horizontal Position400 - 255Set value to 40.
22Gemstar PIP Vertical Position430 - 255Set value to 43.
23Gemstar PIP Window Vertical Size 30 - 13Set value to 3.
Page 3
SET 4733 PSET 4733 P
SET 4733 P
SET 4733 PSET 4733 P
aa
gg
e 1e 1
a
g
e 1
aa
gg
e 1e 1
ERROR CODES CHART
ErrErr
or Codeor Code
Err
or Code
ErrErr
or Codeor Code
DECDEC
DEC
DECDEC
0 00No error code1 0116.0V fault16.0V STBY source is failing.
3 0312.0V run fault12.0V source is failing.
4 04T4 ChipRun supply failed.
8 08T4 ChipX-ray protection caused high voltage shutdown.
9 09T4 Chip (POR)Power supply problem at (POR) power on reset.
10 0AF2 PIP module error (POR)Power supply problem at (POR) power on reset/PIP.
11 0BStereo decoder (POR)Power supply problem at reset/Stereo decoder.
16 10Run IIC Bus held lowRun IIC clock or data held low.
18 12Standby IIC Bus held lowStandby IIC clock or data held low.
23 17Gemstar 4 BoardGuide fatal error on set using Gemstar 4 Board.
24 18Gemstar 4 BoardWatchdog error on set using Gemstar 4 Board.
25 19Gemstar 4 BoardTask monitor error on set using Gemstar 4 Board.
261AGemstar 4 BoardTask monitor error on set using Gemstar 4 Board.
3220Gemstar 4 BoardCPU error on set using Gemstar 4 Board.
34 22Gemstar 4 BoardGemstar fails to acknowledge.
44 2CF2 PIP module errorF2PIP fails to acknowledge.
102 66Octal DACOctal DAC fails to acknowledge.
128 80Stereo decoderStereo decoder fails to acknowledge.
160 A0Main or PIP tuner EEPROMMain or PIP tuner EEPROM fails to acknowledge.
186BAT4 ChipT4 Chip fails to acknowledge.
196C4Main tuner PLL/DACMain tuner PLL IC fails to acknowledge.
198C6Main tuner PLL/DACMain tuner DAC IC fails to acknowledge.
ERRERR
OR CODESOR CODES
ERR
OR CODES
ERRERR
OR CODESOR CODES
HEX HEX
HEX
HEX HEX
ErrErr
or Locationor Location
Err
or Location
ErrErr
or Locationor Location
Condition IndicatedCondition Indicated
Condition Indicated
Condition IndicatedCondition Indicated
TEST EQUIPMENT
Test equipment listed by participating manufacturer illustrates
typical or equivalent equipment used by Sams engineers to obtain
measurements. This equipment is compatible with most types used
by field service technicians.
EquipmentEquipment
Equipment
EquipmentEquipment
OscilloscopeSC3100
Generators
RGBCM2125
Multiburst SignalVG91
Color BarVG91
TV StereoVG91
Digital VOMSC3100
Frequency MeterSC3100
Hi-Voltage ProbeHP200
Accessory ProbesTP212
Isolation TransformerPR570
Capacitance AnalyzerLC102
CRT AnalyzerCR7000
AC Leakage TesterPR570
Inductance AnalyzerLC102
Flyback Y oke TesterTV A92
Field Strength MeterSL753
Transistor TesterTF46
Horizontal AnalyzerHA-2500
Video AnalyzerVG91, TVA92
Sencore No.Sencore No.
Sencore No.
Sencore No.Sencore No.
If certain failures occur, the matching error codes will be stored in the EEPROM. These error codes will be displayed in parameters 1, 2, and 3. The first
failure error code will be stored at parameter 1 and the second failure error code will be stored at parameter 2. Parameter 3 will be updated to display the
most recent failure occurred in the chassis. If a failure of a bus IC occurred, the normal acknowledgment checking of that bus will be disabled in the
service mode and the address of that IC which failed will be stored in one of the error code parameters. After every repair is done to the chassis it is
recommended to check the error code parameters, and reset them back to value 0.
Page 4
RCA MODEL G27648YX1 (CHASSIS CTC203AA)
RCA MODEL G27648YX1 (CHASSIS CTC203AA)RCA MODEL G27648YX1 (CHASSIS CTC203AA)
RCA MODEL G27648YX1 (CHASSIS CTC203AA)RCA MODEL G27648YX1 (CHASSIS CTC203AA)
SET 4733 PSET 4733 P
SET 4733 P
SET 4733 PSET 4733 P
aa
gg
e 1e 1
a
g
e 1
aa
gg
e 1e 1
Page 5
PP
aa
gg
e 2e 2
g
gg
e 2
e 2e 2
SET 4733 SET 4733
SET 4733
SET 4733 SET 4733
P
a
PP
aa
Page 6
SET 4733 PSET 4733 P
SET 4733 P
SET 4733 PSET 4733 P
aa
gg
e 2e 2
a
g
e 2
aa
gg
e 2e 2
Page 7
PP
aa
gg
e 2e 2
a
g
e 2
aa
gg
e 2e 2
SET 4733 SET 4733
SET 4733
SET 4733 SET 4733
P
PP
Page 8
RCA MODEL G27648YX1 (CHASSIS CTC203AA)
RCA MODEL G27648YX1 (CHASSIS CTC203AA)RCA MODEL G27648YX1 (CHASSIS CTC203AA)
RCA MODEL G27648YX1 (CHASSIS CTC203AA)RCA MODEL G27648YX1 (CHASSIS CTC203AA)
SW3410ISwitch207842Channel Up
SW3412ISwitch207842Power
SW3420ISwitch207842Channel Down
SW3421ISwitch207842Volume Up
SW3430ISwitch207842Menu
SW3431ISwitch207842Volume Down
PC Board (2)2518384.5MHz Adapter
Transmitter242524Remote, CRK76TE1
MfrMfr
Mfr
MfrMfr
..
P P
arar
t No.t No.
.
P
ar
t No.
..
P P
arar
t No.t No.
NotesNotes
Notes
NotesNotes
ImporImpor
tant Ptant P
arar
ts Infts Inf
Impor
tant P
ImporImpor
n The par ts listed here are those not usually available from a well-stocked supply cabinet or bin.
n Where items may be replaced with equiv alent parts, several alter nates are sho wn from par ticipating v endors .
n On the par ts lists, saf ety items are mar ked with a
these items .
n When ordering parts, state the model n umber, part n umber, and description.
Many of these parts are available from y our local Sams author ized distrib utor or the man u f acturer of the equipment. Call
Sams for the name of y our nearest distributor:
ar
tant Ptant P
arar
# #
# to remind you that only exact replacements are recommended f o r
# #
Obtaining PObtaining P
Obtaining P
Obtaining PObtaining P
ts Inf
ts Infts Inf
ormationormation
ormation
ormationormation
arar
tsts
ar
ts
arar
tsts
800-428-7267
Or consult the Sams
Infor mation on test equipment and replacement par ts is listed in these pages for the follo wing par ticipating v endors .
Consult the Sams
n NTE Electronics, Inc. (NTE)
Annual Index
Annual Index
for the address of the or iginal equipment man u facturer.
PP
arar
ticipating ticipating
P
ar
ticipating
PP
arar
ticipating ticipating
for their current address.
VV
endorendor
endor
endorendor
ss
s
ss
V
VV
n Sencore, Inc.
RCA MODEL G27648YX1 (CHASSIS CTC203AA)
RCA MODEL G27648YX1 (CHASSIS CTC203AA)RCA MODEL G27648YX1 (CHASSIS CTC203AA)
RCA MODEL G27648YX1 (CHASSIS CTC203AA)RCA MODEL G27648YX1 (CHASSIS CTC203AA)
# For SAFETY use only equivalent replacement part.
(1) Used in chassis CTC203AA5 and CTC203AA9.
(2) Used in chassis CTC203AA.
(3) Bonded part of CRT.
(4) Screen and focus controls are part of T14401.
SET 4733 PSET 4733 P
SET 4733 P
SET 4733 PSET 4733 P
aa
gg
e 4e 4
a
g
e 4
aa
gg
e 4e 4
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